The state of being a lurker, i.e. following the posts on an Internet forum but not posting yourself.
Generic_User: That user Matrix91 used to post funny stuff all the time, but now he seems to have disappeared. He must have descended into lurkhood.

Matrix91: Attention everyone, I've just emerged from lurkhood!

Everyone: Huzzah!
by Atomik Spongeface August 12, 2008
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